Improvement in balancing millstones



H. H. KEN OK. Balancing M' ones,

No. 202,731. Patented April 23,1878.

N. PETERS. PHOTOLITHOGRAFMER WASHINGTON D C UNITED'STA'I'ES PATENTOFFICE.

'HILAND H. KENDRIOK, or

OSWEGO, ASSIGNOR TO MUNSON BROTHERS, 0F

UTIGA, NEW YORK.

IMPROVEMENT IN BALANCING MILLSTONES.

Specification forming part of Letters Patent No. 202,731, dated April23, 1878; application filr d February 9, 1678.

To all whom it may concern:

Be it known that I, HILAND H. KENDRIGK, of Oswego, in the county ofOswego and State of New York, have invented new and useful Improvementsin Mill-Trams, of which the following, taken in connection with theaccompanyin g drawing, is a full, clear, and exact description.

This invention has reference to trams of that class of mills in whichthe upper stone is stationary, and the lower the revolving stone orrunner; and it consists, essentially, in a novel construction andarrangement of devices for supporting the upper stone in its properrelative position above the runner, which devices allow the former toyield and adjust itself to the rocking or vibratory movement of thelatter, and thus maintain a uniform bearing of the respectivegrinding-surfaces.

It also consists in a novel construction of the means of connecting theaforesaid devices to the top stone, which admits of changing the saidstone in its relative circumferential position, and thus augmenting thedurability of its points of support, and better equalizing the abrasionor wearing of the grinding-surfaces of the respective stones, allconstructed and arranged as hereinafter more fully described.

In the accompanying drawing, Figure 1 is a transverse vertical sectionof a set of burrs provided with my improvements, and Figs. 2 and 3 aredetail views.

Similar letters of reference indicate corresponding parts.

A represents the stationary top stone, and B the revolving bottom stoneor runner, of a set of burrs. The latter, when rotated, is liableto.traverse out of its proper plane and acquire a rocking or vibratorymovement, which, when working against the surface of a rigid upperstone, is injurious both to the grindingsurfaces of the respectivestones and to the substance ground by them. It is to obviate theseinjurious effects which this invention has for its object, and to thatend and purpose the following devices are employed.

To the top of the stone A is permanently attached a plate having aninclined concave top surface around the eye of said stone, and providedaround its outer margin with a series of notches or openings, arranged,respecttively, diametrically opposite each other. C is the casinginclosing the upper stone, and having on its under side lugs l 1,extending into the openings in the aforesaid plate, to prevent therotation of the stone. S is the spout, firmly attached to the casing C,and extending some distance into the eye of the stone. To the rear ofsaid spout are pivoted a series of anti-friction rollers, m m, bearingon the inclined annular concave surface of the plate on top of thestone. Diametrically across the spout S is placed a bridge or bail, b,secured at its ends to the top of either the casing C or a flange on thespout. Centrally over the eye of the stone the bail b is provided withan eye, in which is fitted loosely the vertical bolt 0, extendingdownward into the eye of the stone. Above the bail b the said bolt orrod is provided with a nut, n, which either has its under side fittedinto an annular hemispherical cavity around the eye of the bail, or isof ordinary form, and bearing on the flat surface of a hemisphericalwasher fitted into aforesaid cavity, so as to form a ball-andsocketjoint therewith, and thus allow the pendent portion of the bolt tooscillate freely in all directions. The lower extremity of the bolt 0 isprovided with a head having a conveXed or rounded top surface, by whichit supports a bail, I), provided in its center with a correspondingcavity or recess, fitted to the head of the bolt.

The bail b engages at its ends the sleeve 22, which is rigidly securedin the eye of the stone A, and provided around its base with a series ofnotches, r, or other suitable bearingpoints for the said bale. Thesebearings are arranged, respectively, diametrically opposite each other,so that as one pair of them become worn new points of support can bebrought in use; and also the stone may be changed in its relativecircumferential position when found necessary to equalize the wearing ofits grinding-surface, or to provide new bearings for thefriction-rollers m m or the lugs Z I, which latter prevent rotation ofthe stone. The stone A is adjusted in its elevated position and broughtto bear on the rollers m m by means of the nut n on the upper end of thesuspension-rod c, and is thus allowed to oscillate or vibrate freely inall directions, respondent to the like movement of the runner. For thepurpose of obtaining a close joint between the stationary spout S andthe eye of the vibrating stone A, and thus preventing the dust frompassing between the stone A and its surrounding casing O, the spout isprovided at or near its lower extremity with an elastic packing, 10,around its exterior periphery.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is

1. The combination, with the non-revolving stone A, provided with thenotched plate, of the case 0, having lugs I, the bails b and b HILAND H.KENDRICK.

Witnesses D. L. MARSHALL, S. G. MERRIAM.

